Ammo and exteme temperatures

I'm going to be driving to FL in a few weeks where I get to exercise my rights.

I'm going to be taking some ammo with me in the trunk. A few boxes of FMJ and a box of GDHP for my 26. I'm going to be driving from 10 degree weather to about 80 in a span of about 36 hours. Should I be concerned about exposing the ammo to such temperature changes?

Currently the ammo is in a cool climate controlled room. Is ok to keep the ammo in these extreme temperatures (below freeing in IL, scorching heat in the trunk in FL)